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    <title>盒模型</title>
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        div{
            width: 200px;
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<body>
    <div>走进农大
        <ul>
            <li>农大理念</li>
           <li>学术研究</li>
        </ul>
    </div>
    <div>学科概览</div>
    <div>入读农大</div>
    <div>农大英才</div>
    <div>科学研究</div>
    <div>信息公开</div>

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